<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <header class="header" id="myhead">head</header>
    <nav class="navbar" id="mynav">navgator</nav>
    <div class="box" id="mybox" >div.box</div>
    <main class="content" id="main-contaitn">
        <article class="a1">
            <h2>标题</h2>
            <p class="pa">文章1段落</p>
            <p class="pa">文章2段落</p>
        </article>
    </main>
    <form action="">
            <label for="">A</label><input type="checkbox" name='first'>
            <label for="">B</label><input type="checkbox" name='first'>
        </form>
    

</body>
</html>